So, this is the real question at issue: "Is it expected that if you propose a merge, you are also signing on to complete the merge and/or update the bio of the newly merged individual also?" Some seem to be saying "yes".
I believe we should not place that limitation/expectation on merge proposers, because, as Liz's comment points out, it does help us to achieve the goals of WikiTree simply to propose the merge, even if you don't complete the merge. By the same token, it also helps the goals of the community to complete the merge, even if you don't update the biography section.
We each bring our own sets of strengths, weaknesses, and research goals to this project and it's my thinking that we should allow each person to take on only those tasks that they're willing and able to complete. So if any of us notices what looks like a needed merge, we should propose it, even if we are not 100% certain, and even if we don't have the time or expertise to take those next steps, leaving them to be completed by someone who does either currently or at a later date.